[R] x,y,z table to matrix with x as rows and y as columns
jo.irisson at gmail.com
Tue Jul 24 19:23:33 CEST 2007
I am sure I am missing something obvious but I cannot find the
function I am looking for. I have a data frame with three columns: X,
Y and Z, with X and Y being grid coordinates and Z the value
associated with these coordinates. I want to transform this data
frame in a matrix of Z values, on the grid defined by X and Y (and,
as a plus, fill the X.Y combinations which do no exist in the
original data frame with NAs in the resulting matrix). I could do
this manually but I guess the appropriate function should be
somewhere around. I just can't find it.
Thank you in advance for your help.
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